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So I actually just went through and re-plumbed all the piping coming from the waste tank. When I did this I changed to the bayonet style connection on the end. 

I am not sure if all coaches were plumbed this way, but my gray waste line does not go into the top of the waste tank, its plumbed in between two Dupree valves with a Y connection. So there is a air operated Dupree valve just before the hose connection, and then there is another manual Dupree valve just before the waste tank, the gray line comes in between these two valves. I am assuming this was done so you could drain the gray water off separately if you wanted by closing the valve at the waste tank and opening the air operated valve. I will try to get a picture of the set up. But on the other hand if you want gray water to go into the waste tank, you have to open the manual valve at the tank and of course the air operated valve stays closed to keep everything contained. So here is the issue I am having, I filled the waste tank with water to test all my new connections and after all this work the manual valve is leaking. Its leaking around the body seal, so this is the rubber o-ring seal that is around the paddle assembly that slips down into the body of the valve. I am thinking this was an issue before as the previous owner had smeared silicone all over this area on the old valve. I though the leak was mainly because the old valve body had a crack but it appears that this may have been an issue as well. I am thinking that the Dupree valves are not rated to contain the pressure of a full tank with the valve in the open position, as that rubber o-ring around the paddle assembly is the only think keeping it sealed. 

So does anyone else have this similar situation of how their gray water is plumbed? 

Here is the o-ring I am talking about: